twiddle
🇺🇸
/ˈtwɪdl/
🇬🇧
/ˈtwɪdl/
to play with or manipulate something, often with nervousness or boredom
He was twiddling his thumbs while waiting for the meeting to start.
a small, often quick movement or adjustment
With a quick twiddle of the knob, the radio came to life.
an ornamental detail or flourish, especially in music or design
The musician added a few twiddles to the melody to make it more interesting.